function index(tbl){
	var cnd=Cnd.where("1","=",1).desc("num")
	if(tbl.sort!=undefined){
		cnd.desc(tbl.sort)
	}else if(tbl.tag!=undefined&&tbl.tag!="all"){
		cnd.and("tag","=",tbl.tag)
	}
	var combos=$list("combo",cnd)
	return combos;
}
function combo(tbl){
	var combo=$fetch("combo","id="+tbl.id)
	combo.put("courses",$list("course",Cnd.where("id","in",combo.course)))
	return combo;
}